Tag: excretory system in human

Questions Related to excretory system in human

Average quantity of urea excreted daily humans per day is

evs - i excretion in living organisms other systems in the body excretory system in human human excretory organs

  1. 10 - 15 g

  2. 25 - 30 g

  3. 40 - 50 g

  4. 100 - 500 mg

Show answer
Correct Option: B
Explanation:

The composition of urine in humans is 95% water, 2.5 % urea and 2.5% other waste. As urea is the major excretory waste humans are considered ureotelic., On an average, 25-30 g of urea is excreted out per day.

So, the correct answer is '25-30 g'.

The composition of urine is

evs excretion in living organisms other systems in the body excretory system in human human excretory organs

  1. 25% water, 2.5 % urea and 2.5% other waste

  2. 95% water, 2.5 % urea and 2.5% other waste

  3. 95% water, 2.5 % urea and 12.5% other waste

  4. None of the above

Show answer
Correct Option: B
Explanation:
An adult human on an average excretes 1 to 1.5 liters of urine per day. It is light yellow in color, slightly acidic with a characteristic odor. The composition of urine is 95% water, 2.5 % urea and 2.5% other waste. As urea is the major excretory waste humans are considered ureotelic.
So, the correct answer is '95% water, 2.5 % urea and 2.5% other waste'.

The conduction of urine from kidney to the urinary bladder takes place by

evs excretion in living organisms other systems in the body excretory system in human human excretory organs

  1. Ureter

  2. Urethra

  3. Ovary

  4. None of the above

Show answer
Correct Option: A
Explanation:

Urine is formed in the kidney. From the kidneys, two tubes called ureter one from each kidney descend to the urinary bladder which conducts urine from the kidneys to the urinary bladder. Urinary bladder receives and stores urine. Later, on stimulus urine is excreted to outside through urethra.

So, the correct answer is 'Ureter'.

The tubes which connect the kidney and urinary bladder is known as

evs excretion in living organisms other systems in the body excretory system in human human excretory organs

  1. Ureter

  2. Kidney

  3. Urethra

  4. None of the above

Show answer
Correct Option: A
Explanation:
The tubes which connect the kidney and urinary bladder are known as the ureter. Urine is formed in the kidney. From the kidney, urine is propelled into the urinary bladder through the tubes called ureters which are made of smooth muscle fibres.
So, the correct answer is 'Ureter'.

Choose the correct answers from the following given.
Which of the following is not an excretory organ?

evs excretion in living organisms other systems in the body excretory system in human human excretory organs

  1. Spleen

  2. Kidney

  3. Liver

  4. Lungs

Show answer
Correct Option: A
Explanation:

Although kidney is the main organs of excretion, several other organs also excrete wastes. They include the liver, skin, and lungs.  Excretory system of a human consists of kidneys, ureters, urinary bladder, and urethra.

So the correct answer is spleen. 

Choose the correct answers from the following given.
The mammalian excretory system involves all of the following except

evs - i excretion in living organisms other systems in the body excretory system in human human excretory organs

  1. reabsorption of high molecular weight proteins from the glomerular filtrate

  2. active transport of chloride ions from the filtrate into the peritubular tissues

  3. release of nitrogenous wastes into the intestines

  4. hormonal control of permeability of walls in various excretory tubules

Show answer
Correct Option: C
Explanation:

The excretory system in the mammals deals with the absorption on the basis of the permeability of the system , among all the options given the option other than the function of the excretory system is releasing nitrogenous wastes.

Hence the correct answer is C .

The primary threshold substance are............... .

evs - i excretion in living organisms other systems in the body excretory system in human human excretory organs

  1. Urea and uric acid

  2. Potassium and calcium

  3. Glucose and amino acids

  4. Plasma proteins

Show answer
Correct Option: A
Explanation:

A substance present in blood is filtered through kidneys. Depending on the concentration they are divided as follows, High threshold substances(such as chlorides or glucose), Low threshold substances (such as phosphates or urea). No-threshold substances (such as creatinine sulfate). The primary threshold substance is Urea and uric acid.

So the correct option is 'Urea and uric acid.'

In mammals, the urinary bladder opens into

evs excretion in living organisms other systems in the body excretory system in human human excretory organs

  1. Uterus

  2. Urethra

  3. Vestibule

  4. Ureter

Show answer
Correct Option: B
Explanation:

The urinary bladder is the organ that collects urine excreted by the kidneys before disposal by urination. Urine enters the bladder via the ureters and exits via the urethra. 

So, the correct answer is option B.

The interior of the urinary bladder is lined by

evs - i excretion in living organisms other systems in the body excretory system in human human excretory organs

  1. Columnar epithelium

  2. Squamous epithelium

  3. Transitional epithelium

  4. Goblet cells

Show answer
Correct Option: C
Explanation:

The urinary bladder is lined with transitional epithelium. It does not produce mucus.

Kidneys, skin and lungs are

evs excretion in living organisms other systems in the body excretory system in human human excretory organs

  1. Excretory organs

  2. Digestive organs

  3. Reproductive organs

  4. None of the above.

Show answer
Correct Option: A
Explanation:

The lungs, kidneys, and skin are excretory organs. Excess carbon dioxide is removed from the body through the lungs. Excess urea, water, and salts are removed by the kidneys and leave the body as urine. Excess water and salts also leave the body through the skin through sweat.

So, the correct answer is option A.